One of the two biggest trade unions in Bulgaria has urged the president to convene a Grand National Assembly in reaction to the escalating tensions in the country.

“Bulgaria needs to urgently re-write the rules, which define the state governs. Otherwise, if he 42nd National Assembly failed to provide a reasonable solution, we will stage a national strike to protect the interests of our members and fellow citizens,” the trade union “Podkrepa” said in a statement, circulated to the media.

The news comes days after Bulgaria's president Rosen Plevneliev said on Friday that another early election should take place to deal with daily anti-government street protests.

Bulgaria has been in political turmoil for months.

The current government took office after a snap election in May, but mass protests, calling for its resignation erupted in mid-June over the controversial appointment of a media mogul, Delyan Peevski, as head of the national security agency.

Prime Minister Plamen Oresharski, who heads a Socialist-led coalition, later revoked the appointment and apologized, but protests against his coalition government continued.

His predecessor as prime minister, Boyko Borisov, resigned in February after big street protests about high electricity prices, austerity measures and mismanagement.